Description:

This diagnostic trouble code (DTC) UIC 523652.02 is generated when the control unit detects an erroneous signal in the circuit of the control unit identification during initializing (control unit boot sequence after the ignition is switched ON). This indicates the control unit may be connected to the wrong wiring harness connector.

Reaction:

When this error occurs, the control unit may prevent the vehicle from starting or operating correctly due to the identification error, potentially activating a fail-safe mode.

Recommendations:

• Inspect Wiring Harness Connections:
  • Verify that the control unit is connected to the correct wiring harness connector.
  • Check for any loose, damaged, or misconnected harnesses.
• Verify Connector Pins:
  • Ensure that the connector pins are not bent, corroded, or damaged.
  • Confirm that the pins are making proper contact with the control unit.
• Reprogram Control Unit:
  • If the problem persists, reprogram the control unit using the latest software updates.
• Replace Control Unit:
  • If the identification error continues to show faults, consider replacing the control unit with a new or refurbished unit.
• Consult Technical Support:
  • If the issue remains unresolved, contact John Deere technical support for further diagnostics and potential solutions.

Note:

Proper connection of the wiring harness is crucial for the correct identification and operation of the control unit. Regular checks and maintenance can prevent such issues.